Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers

The MAX4238/MAX4239 are low-noise, low-drift, ultra-high precision amplifiers that offer near-zero DC offset and drift through the use of autocorrelating zeroing techniques. This method constantly measures and compensates the input offset, eliminating drift over time and temperature and the effect of 1/f noise. Both devices feature rail-to-rail outputs, operate from a single 2.7V to 5.5V supply, and consume only 600µA. An active-low shutdown mode decreases supply current to 0.1µA.

The MAX4238 is unity-gain stable with a gain-bandwidth product of 1MHz, while the decompensated MAX4239 is stable with AV ≥ 10V/V and a GBWP of 6.5MHz. The MAX4238/MAX4239 are available in 8-pin narrow SO, 6-pin TDFN and SOT23 packages.

Applications

* Electronic Scales * Instrumentation Amplifiers * Medical Instrumentation * Strain Gauges * Thermocouples

* DC Performance Ideal for High-Precision Sensor Interface

* Ultra-Low, 0.1µV Offset Voltage

* 2.0µV (max) at +25°C

* 2.5µV (max) at -40°C to +85°C

* 3.5µV (max) at -40° to +125°C

* Low 10nV/°C Drift

* Low Noise: 1.5µVP-P from DC to 10Hz

* 150dB AVOL, 140dB PSRR, 140dB CMRR

* High Gain-Bandwidth Product

* 1MHz (MAX4238)

* 6.5MHz (MAX4239)

* Ground-Sensing Input

* Rail-to-Rail Output (RL = 1kΩ)

* Low Power Consumption Reduces System Power

* Single 2.7V to 5.5V Supply Voltage Range

* 600µA Supply Current

* 0.1µA Shutdown Mode

* Low Power Consumption Reduces System Power

* AEC-Q100 Qualified, Refer to Ordering Information for the List of /V Parts